高吸水性树脂的性能研究

高吸水性树脂作为一种功能高分子,其应用越来越广,是一种很有发展前途的新材料。本 文介绍了高吸水性树脂的特点、性能、结构、吸水机理及性能测试方法。     

用同步辐射实现X射线干涉技术的实验研究

根据Ｘ射线干涉的特点，制出ＬＬＬ型Ｘ射线干涉仪器。Ｘ射线源选用同步辐射光，充分利用其强度大，波长丰富和准直性好的优点，在北京同步辐射实验室利用４Ｗ１Ａ束线进行了Ｘ射线干涉实验，在拍摄的底片上比较清楚地观察到了Ｘ射线霈条纹。     

Synthesis and characterization of the narrow polydispersity fullerene-end-capped polystyrene

Summary A living free radical polymerization process was adopted to synthesize a narrow polydispersity fullerene-end-capped polystyrene(NPFECPS). The UV-Vis, DSC, GPC demonstrated that fullerene(C₆₀) was chemically bonded to polystyrene successfully, and C₆₀ was almost monosubstituted. The NPFECPS can be dissolved in a variety of solvents, such as THF, toluene, trichloromethane, and so on. The good photoconductivity is also found for NPFECPS.     

Derivation of general algebraic constraint conditions for ‘weak’ C1 continuity for thin shells

Employing C⁰ conforming thin shell elements, a derivation of general algebraic equations for enforcing C¹ interelement continuity in a ‘weak’ (that is, integral) sense is presented. ‘Restoration’ of strict C¹ continuity is treated as a special case of the proposed concept. The cónstraint equations do not depend on the metric of the given shell. While, for smooth shells, this is automatically the case, if strict C¹ continuity is ‘restored’, the constraint equations usually depend on the metric of the shell, if only ‘weak’ C¹ continuity is enforced. The independence of the proposed constraint equations of the metric of the shell facilitates the computer implementation of the proposed approach. It is demonstrated that linear dependencies among the constraint equations can easily be detected and a priori be eliminated. It is also shown that, in certain cases, it is very easy to switch from an (intrinsically) element-interface-oriented concept to an element-oriented technique of generating constraint equations with the help of the digital computer. The latter mode offers computational advantages, if an element-oriented mode of solving the global system of algebraic equations (equilibrium and constraint equations), such as Irons' wave front technique, is adopted.     

大型工件平面度平行度垂直度误差计算与评定方法

提出了一种实用的大型工件平面度、平行度、垂直度误差的计算与评定方法。这种方法适用于各种不规则、不连续的测量表面。评定程序采用最小二乘和最小条件法，搜素速度快，评定结果精度高。     

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Thermo-visco-elasto-plastic FE analysis of a composite X-ray rotary anode under cyclic thermal loading

Finite Element (FE) analyses have been carried out to study the influence of thermal treatment during processing of a composite X-ray anode. It is shown that the distribution of stresses can be evaluated satisfactorily by a time-independent type of analysis. However, to obtain a realistic deformational behavior of the anode, the consideration of time-dependent (creep) effects is mandatory.     

外腔半导体激光器大尺寸无导轨测长研究

利用平面镜外腔半导体激光器和连续调频波技术,进行了大尺寸无导轨测长研究。给出了10m测量范围内的实验结果。     

Preparation of Nano‐Structured Polyaniline Composite Film via “Carbon Nanotubes Seeding” Approach and its Gas‐Response Studies

Summary: Polyaniline composite film with nano‐structure was prepared through a chemical oxidation method by adding carbon nanotubes (CNTs) as nano‐fiber seeds. Spin‐coating or casting method was employed on the interdigital electrodes of carbon and the composite film was formed with an in‐situ polymerization approach. The gas‐response to trimethylamine was also examined at room temperature. It was found that the difference was not only in the morphology, but also in the value of gas‐sensitivity. Comparing with films without the CNTs, the value of gas‐sensitivity decreased dramatically, while the baseline current of the sensor increased remarkably. This method can be an effective way to adjust the gas‐sensitivity of sensors made from polyaniline composite film by adding a small amount of carbon nanotube. XRD data showed that the degree of orientation of polyaniline was increased greatly with the addition of CNTs.

Morphology and reproducibility (inset) of polyaniline composite film containing carbon nanotubes.